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8/10/2019 Synapseindia DOTNET Development Part 1
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ASP.NET Tips and Tricks
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What we will cover
Development Tips and Tricks
Error HandlingTips and Tricks
Production Tips and Tricks
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Session Prerequisites
ASP Basic knowledge of ASP.NET
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Agenda
Development Tips and Tricks
Error Handling Tips and Tricks
Production Tips and Tricks
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Development Tips And Tricks
ASP.NET provides built-in file upload support No posting acceptor required
No third party components required
Accessible through two APIs: Request.Files collection server control
HttpPostedFileObject:
HttpPostedFile.InputStream HttpPostedFile.ContentType
HttpPostedFile.FileName
HttpPostedFile.SaveAs(fileLocation)
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Sub Btn_Click(Sender as Object, E as EventArgs)
UploadFile.PostedFile.SaveAs("c:\foo.txt")
End Sub
Select File To Upload:
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Demonstration 1File Upload
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File system is not the only option
Example: Storing within SQL
Access uploaded file as bytearray
Store file within SQL as image (blob)
Store ContentTypeand ContentLengthalso
Provide Edit Link to display page
Edit Link Page sets ContentTypeheader and thenwrites binary array back to client
Development Tips And Tricks
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Demonstration 2File Upload With SQL
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Rich server image generation
Additionally supports resizing & cropping
Overlays on top of existing images
Read/Write Any Standard IO Stream
System.Drawing
Dynamically generate GIFs/JPGs from .aspx Set ContentTypeappropriately
Optionally output cache results
Development Tips And Tricks
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Demonstration 3Image Generation
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ASP.NET
Enables output of XML
Enables optional XSL/T transform of XML
Binding options
File system
Database item
Built-in caching
Ensure efficient re-use
Improves performance
Development Tips And TricksASP.NET XML Server Control
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Development Tips And Tricks
file sample
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Demonstration 4Static XML
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Sub Page_Load(Sender as Object, E as EventArgs)Dim conn as New SqlConnection(connectionString)
Dim cmd as New SqlDataAdapter(select * from products",
conn)
Dim dataset As New DataSet()
cmd.Fill (dataset, "dataset")
Dim XmlDoc as XmlDocument = New XmlDataDocument(dataset)
MyXml1.Document = XmlDoc
End Sub
Development Tips And Tricks
data sample
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Demonstration 5Dynamically Bind XML
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Application specific settings
Stored in web.configfiles
Enables devs to avoid hard-coding them
Administrators can later change them
Examples:
Database Connection String MSMQ Queue Servers
File Locations
Development Tips And TricksApp settings
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1. Create web.config file in app vroot:
To return value:
Configuration.AppSettings(dsn)
Development Tips And TricksApp settings steps
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